Hi, I am a current Case student as well and will try to answer your questions.
The SAGES program is a requirement for all students, no matter the major. It includes a 'first seminar' two 'university seminars' a 'departmental seminar' and a 'senior capstone project.' The first three of these are all akin to English composition classes, although also try to incorporate more discussion and focus on a particular theme.
The SAGES 'curriculum' also incorporates a series of 'gen eds.' The exact requirements depend on what school (College of Arts and Sciences, School Of Engineering, etc) your major is in. To really see what they actually are, view the FYI guide for new students here:
http://www.case.edu/provost/ugstudie...IGuide0910.pdf
The requirements for the College of Arts and Science majors, for instance, are on page 38 of the guide (which displays as page 33 on my PDF reader) Engineering requirements are on page 64 (57 of my PDF reader)
There is no foreign language requirement, but languages can satisfy the 'arts and humanities' requirement, for instance.